日志如下：
bootfile_mode=4
SUNXI_EFEX_ERASE_TAG
erase_flag = 0x12
origin_erase_flag = 0x12
FEX_CMD_fes_verify_status
FEX_CMD_fes_verify last err=0
flash sectors: 0x748000
the 0 mbr table is ok
the 1 mbr table is ok
the 2 mbr table is ok
the 3 mbr table is ok
MBR DUMP**
total mbr part 6
part[0] name :boot-resource
part[0] classname :DISK
part[0] addrlo :0x8000
part[0] lenlo :0x10000
part[0] user_type :32768
part[0] keydata :0
part[0] ro :0
part[1] name :env
part[1] classname :DISK
part[1] addrlo :0x18000
part[1] lenlo :0x8000
part[1] user_type :32768
part[1] keydata :0
part[1] ro :0
part[2] name :boot
part[2] classname :DISK
part[2] addrlo :0x20000
part[2] lenlo :0x20000
part[2] user_type :32768
part[2] keydata :0
part[2] ro :0
part[3] name :rootfs
part[3] classname :DISK
part[3] addrlo :0x40000
part[3] lenlo :0x200000
part[3] user_type :32768
part[3] keydata :0
part[3] ro :0
part[4] name :private
part[4] classname :DISK
part[4] addrlo :0x240000
part[4] lenlo :0x8000
part[4] user_type :32768
part[4] keydata :0
part[4] ro :0
part[5] name :UDISK
part[5] classname :DISK
part[5] addrlo :0x248000
part[5] lenlo :0x0
part[5] user_type :0
part[5] keydata :0
part[5] ro :0
[97.771]erase all part start
need erase flash: 18
[97.775][mmc]: erase from: 0, to: 7634943, cnt: 7634944, erase_group: 1024
[97.790][mmc]: sunxi_mmc_do_send_cmd_common: cmd 38 wait rsp busy 0x8 ms
[97.797]erase secure storage: 0 ok
SUNXI_EFEX_MBR_TAG
mbr size = 0x10000
[97.803][mmc]: mmc 2 data timeout 80 status 94
[97.807][mmc]: smc 2 err, cmd 25, DCE
[97.811][mmc]: mmc 2 close bus gating and reset
[97.815][mmc]: mmc write failed
[97.818][mmc]: write block failed